Suncook River Lake
Suncook River Lake in Merrimack County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1.5 acres.
- Area
- 2 acres
- Public access
- Yes
Why Suncook River Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Suncook River Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Suncook River Lake is a 2-acre lake in Merrimack County, New Hampshire. Limited fish-species data available. Public access is available with 5 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-11-09. Grade methodology: LakeGrade methodology.
Watch Suncook River Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Suncook River Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Suncook River Lake
Compare lakeside cabins, hotels, and vacation rentals near Suncook River Lake in Merrimack County, New Hampshire — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Suncook River Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2 acres |
| Public Access | Yes |
No bathymetric survey has been published for Suncook River Lake, so its depth is not documented here.
Recreation & Access
- Lambert ParkPublic
- Ferry StreetPublic
- Public Service of New HampshirePublic
- Exchange Street SitePublic
- Riverside ParkPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Suncook River Lake
Reservoir Info (USACE NID)
Suncook River Lake is a man-made reservoir impounded by the China Mill Dam (completed 1860), built primarily for hydroelectric on the Suncook River; concrete-type dam, 29 ft tall and 275 ft long.
- Surface area
- 1.5 ac
- Normal storage
- 22 ac-ft
- Max storage
- 33 ac-ft
- Drainage area
- 259 sq mi
- Hazard class
- High
- Owner
- NH HYDRO ASSOC
Source: USACE National Inventory of Dams, NID ID NH00023 · Operator website · Matched by proximity (0.54 km)
EPA Impairment Status
Suncook River Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHIMP700060503-13 · Official waterbody report · Matched by proximity (0.44 km)
Graded lakes near Suncook River Lake
Suncook River Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Merrimack County
Frequently asked questions about Suncook River Lake
Where is Suncook River Lake?
- Suncook River Lake is a lake in Merrimack County, New Hampshire. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Suncook River Lake?
- Suncook River Lake in Merrimack County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1.5 acres.
Is Suncook River Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Suncook River Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Suncook River Lake?
- Suncook River Lake has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Lambert Park, Ferry Street, Public Service of New Hampshire, Exchange Street Site, among others. Public access is listed as yes.
Explore Suncook River Lake across LakeGrade
More New Hampshire Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
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Belknap County · 14.2 ft
Where this data comes from
9 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133009 samples · 2020–2021
Analytical methods
- Turbidity by Nephelometry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory